The Team plan is geared towards agencies and freelancers: instead of an app, you get a seat (that includes Pro plan features), so you can develop an app for your client without having to pay Pro plan pricing for it. Developers that are a part of your team can work together on a single app as well. Cherry on top of the cake—you get affiliate rewards on payment plans your client will make, with up to 50% in remuneration.
The App plans feature operational limits for a single app - so if you want to have 3 simultaneous apps in development, you’ll have to purchase 3 app plans. You can learn more about the difference between the two here